300M, Concorde, Intrepid, LHS, 1998-2004

Diagnosis & Testing

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NOTE
Inspect the ignition coil for damage, carbon tracking on the coil or a damaged spark plug insulator boot. If a problem is found, replace the ignition coil.

  1. Turn the ignition off.
  2.  
  3. Remove the ignition coil.
  4.  
  5. Install a spark tester(s) to the ignition coil.
    NOTE
    On the 2.7 and 3.5L engines, cylinders 1, 3 and 5, it is necessary to remove the upper intake to access the ignition coils. Once the ignition coil has been removed from the cylinder head, the intake must be reinstalled to be able to crank the engine. Move the ignition coil harness connector through the slots in the upper intake and then connect the coil to the harness connector. Secure the upper intake to the lower intake in accordance with the service information.

  6.  
  7. While cranking the engine observe the spark coming from the spark tester.
    NOTE
    A crisp blue spark that is able to jump the gap of the spark tester should be generated.

  8.  
  9. Turn the ignition off.
  10.  
  11. Disconnect the Ignition Coil harness connector.
  12.  
  13. Ignition on, engine not running.
  14.  
  15. With a scan tool, actuate the ASD Relay.
  16.  
  17. Using a 12-volt test light connected to ground, probe the (K343) ASD Relay Output 2 circuit in the Coil on Plug harness connector.
  18.  
  19. If the test light doesn-t illuminate brightly
    1. Repair the open or short to ground in the (K343) ASD Relay Output 2 circuit between the IPM and Coil harness connector.
    2.  

  20.  
  21. If the test light illuminate brightly check the ignition coil resistance.
    1. Turn the ignition off.
    2.  
    3. The following resistance measurement should be taken at 70°-80° F.
    4.  
    5. Measure the resistance of the Ignition Coil.
    6.  
    7. If the resistance is not between 0.53 to 0.65 ohms at 77°F (25°C) for the Ignition Coil being tested replace the Ignition Coil.
    8.  
    9. If the resistance is between 0.53 to 0.65 ohms at 77°F (25°C) for the Ignition Coil being tested:
      NOTE
      Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.


      WARNING
      Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.


      NOTE
      Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.



      Using a 12-volt test light connected to a 12-volt source, probe the (K19) Coil Control No.1 circuit.
       
      Crank the engine for 5 seconds while observing the test light.
       
      If the test light is brightly blinking while cranking the engine replace the Ignition Coil.
       
      If the test light is ON constantly while cranking the engine check for (K19) coil control no. 1 circuit shorted to ground.
       
      Turn the ignition off.
       
      Disconnect the C2 PCM harness connector.
       
      Measure the resistance between ground and the (K19) Coil Control No.1 circuit in the Ignition Coil harness connector.
       
      If the resistance is below 100 ohms repair the short to ground in the (K19) Coil Control No.1 circuit.
       



      If the resistance is above 100 ohms, using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
       
      If there were any problems found repair as necessary.
       
      If there were no problems found, replace and program the Powertrain Control Module per Service Information.
       
      If the test light is OFF constantly while cranking the engine. Inspect for (K19) coil control no.1 circuit open.
       
      Turn the ignition off.
       
      Disconnect the C2 PCM harness connector.
       



      Measure the resistance of the (K19) Coil Control No.1 circuit from the Ignition Coil harness connector to the appropriate terminal of special tool #8815.
       
      If the resistance is above 5.0 ohms
       
      Repair the open in the (K19) Coil Control No.1 circuit.
       



      If the resistance is below 5.0 ohms using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
       
      If there were any problems found repair as necessary.
       
      If there were no problems found, replace and program the Powertrain Control Module per Service Information.
       

    10.  

  22.  

 
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